Across
- 1. Spiny-skinned animal
- 4. Soft-bodied animal
- 7. Toxin concentration increase
- 8. Egg membrane vertebrate
- 10. Flatworm phylum
- 12. Stinging-cell animal
- 14. Spinal cord animal
- 15. Critical ecosystem species
Down
- 2. Nutrient water pollution
- 3. Roundworm phylum
- 5. Community replacement
- 6. Environmental health species
- 9. Fish gill cover
- 11. Segmented worm
- 13. Jointed-leg invertebrate